Initial discomfort, such as tingling or minor gum bleeding, may occur due to the high-frequency vibrations of the toothbrush as your gums adjust to this efficient cleaning method. This should subside within 1-2 weeks. If discomfort persists beyond this period, it may indicate gum issues; in such cases, stop using the product and consult a dentist.

Note: Sensitive users should start with the Gentle mode.

1. The noise is normal and comes from the motor during vibration. All our products undergo a full inspection before shipping and this does not affect normal use.

2. Ensure the brush head is properly attached; it should have less than 1mm gap between the motor shaft and the top of the brush head.

If you notice any unusual or abnormal sounds, please request after-sales support from the purchase platform.

1. Ensure the charging environment is between 5-45°C. Extreme temperatures may affect charging.

2. Check if the charging base is clean and free from debris. Clean it and try charging again.

3. Verify that the charging cable and adapter are functioning correctly (ensure you are using a 5V/1A adapter from a reputable manufacturer).

4. Check if the indicator light on the device is breathing or flashing during charging.

If the issue persists after these checks, please request after-sales support from the purchase platform.

1. Check if the device is out of battery. If the battery indicator flashes red, charge the device immediately.

2. Ensure the device is not connected to the charging base, as it cannot be powered on while charging. Disconnect the charging base.

If the issue persists after these steps, please request after-sales support from the purchase platform.

1. Check if the brush head is inserted in the correct direction. Try rotating the brush head 180 degrees and refer to the manual for proper installation.

2. The brush head needs a snug fit with the motor shaft, so it may require slight force to attach.

3. Inspect the inside of the brush head for any debris that might be blocking insertion.

4. Check the motor shaft for any obstructions that might prevent the brush head from fitting.

5. Ensure you are using only the brush heads designed for this product.

If the issue persists after these checks, please request after-sales support from the purchase platform.

1. Ensure the brush head is properly attached. The brush head should be mounted on the motor shaft with less than a 1mm gap from the top of the body. It may require some force to secure it.

2. Note that NEOS II has three intensity modes. If the vibration feels weak, try selecting a higher intensity mode for stronger vibrations.

A slight odor right after unboxing is normal and typically results from the product being sealed in packaging for an extended period. This smell will dissipate after a few uses and does not pose any harm to health. Please use the product with confidence.